Driver, who has three years of eligibility remaining, entered the transfer portal on December 5.
Rucci comes from Wisconsin with two years of eligibility remaining.
Mayer spent one year at Wisconsin and has no recorded appearances or statistics.
Beamon was the third Nittany Lion to announce his return.
Potts spent one season at Penn State after four years at Minnesota.
Felkins went 14-19 on field goal attempts during the 2023 season.